tool works but the led worklight doesn't come on anymore, did i burn it out?

Diagnosis

The LED worklight on the Makita XWT15Z is designed for extreme durability, meaning it is highly unlikely that the diode itself has "burned out" from electrical failure. These LEDs are rated for tens of thousands of hours. Instead, the failure is almost always mechanical. Because the XWT15Z is a high-torque impact wrench, it generates significant internal vibration and axial shock every time the anvil strikes. Over time, these vibrations cause "metal fatigue" in the thin gauge wiring leading to the LED assembly or cause a cold solder joint on the internal driver board to crack. When this happens, the electrical circuit is interrupted. You can confirm this by triggering the tool while applying slight pressure to the housing near the light; if the light flickers, you have a loose connection or a fractured solder joint rather than a dead bulb.

How to Fix It

To repair the LED circuit, you will need a T10 Torx driver, a fine-tip soldering iron (30W-60W), and a small spool of 60/40 rosin-core solder.

1. Remove the 18V LXT battery immediately to prevent accidental trigger activation.
2. Using the T10 Torx driver, remove the housing screws. Pay close attention to the screw lengths, as the Makita chassis uses varying lengths that must be returned to their exact original positions to avoid piercing internal components.
3. Carefully split the plastic clamshell housing. Use a plastic pry tool to avoid marring the casing.
4. Locate the LED assembly near the base of the handle. Follow the two thin wires (typically red and black) from the main trigger switch assembly to the LED diode board.
5. Inspect the solder points where the wires meet the small PCB. Look for "ring cracks" around the solder joints.
6. Heat the existing solder joint with your soldering iron and apply a small amount of fresh solder to bridge any cracks and secure the wire.
7. If a wire has snapped entirely, strip 2mm of insulation from the wire end, tin it with solder, and solder it back to the corresponding positive/negative pad on the board.
8. Reassemble the housing, ensuring the wires are tucked into the molded channels so they aren't pinched when the shells are tightened.

If That Didn't Work

• Check the trigger switch assembly. On the XWT15Z, the LED is tied to the trigger pull. If the internal contact for the light circuit within the switch has failed, the light won't trigger even if the motor does. You can test this by using a multimeter to check for continuity between the switch output and the LED input while the trigger is depressed.
• Inspect the LED diode for physical cracking. While rare, a severe drop of the tool on a concrete surface can crack the diode crystal. If the LED looks clouded or has a visible hairline fracture, the entire LED board assembly must be replaced.
• Verify the battery terminal tension. In rare cases, a worn battery terminal can provide enough current to run the motor but not a stable enough connection for the low-voltage LED circuit. Try a different, fully charged 18V LXT battery to rule out power delivery issues.

Heads Up

• Avoid using high-wattage soldering irons or leaving the iron on the LED board for more than 3 seconds; the small PCB is thin and can delaminate or warp, which will permanently destroy the light.
• When reassembling, ensure the rubber grip is seated perfectly in its groove. If the grip is pinched, it can put pressure on the LED wiring, leading to another break in a few weeks of use.
• Keep the LED lens clear of grease and metallic shavings. While the lens is durable, abrasive metal dust can scratch the plastic, diffusing the light and making it appear dimmer than it actually is.